compiling the program

hi i m very new to java n hv just started learning i tried to compile a program but failed
i wrote my program on notepad which is
// Hello.java
import java.util.*;

public class Hello

{ public static void main(String[] args)

{
System.out.println("Hello, it's:");

system.out.println(new Date());

}

}
n saved it as Hello.java in C:\Program Files (x86)\Java\jdk1.7.0_21\bin
but when i opened the command prompt and went to the above directory and typed C:\Program Files (x86)\Java\jdk1.7.0_21\bin\javac Hello.java
as i was instructed i got a msg telling
"error occurred during initialization of vm
java/lang/noclassdeffounderror java/lang/Object"

pls pls pls can someone tell me what am i doing wrong?
thnx in advance.....pls help

Re: compiling the program

First of all, please use proper spelling and grammar. That's hard enough for me to read, and I'm a native English speaker. Many of our users are not, so using abbreviations actually decreases your chance of getting help- and in the long term, makes you look lazy and unprofessional.